Why celebrity support may actually hurt Hillary Clinton’s campaign

Far from giving Hillary Clinton a boost in the polls, increasing celebrity support may deter disenfranchised voters from opting for her, a senior economist said on Wednesday.

Katy Perry and a string of other musicians, actors and models took to Twitter on Monday to express support for Democrat Clinton over Republican Donald Trump during the first debate between the two presidential candidates.

However, Larry Hatheway, chief economist at asset management firm GAM and a joint American-British citizen, told CNBC that this type of support reinforced Clinton's image as the "establishment" candidate.

"Hillary Clinton, the Democrats and Obama and so forth have been associated with what were called the cultural elite of the United States and therefore endorsements that come from that set, for them, probably actually reinforce perceptions among those that feel disenfranchised that it is a little bit of 'us versus them," Hatheway said.

Celebrities who have expressed support for Trump include American footballer Tom Brady, and Clint Eastwood.

"When someone from that milieu — Clint Eastwood, whoever it might be — supports Donald Trump, it probably carries a bit more weight because it is, in fact, running against perhaps that tendency (for celebrities to support Clinton)," Hatheway said.